Quarterly report pursuant to Section 13 or 15(d)

Debt - Additional Information (Detail)

v3.10.0.1
Debt - Additional Information (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Shares Issued And Outstanding [Line Items]    
Additional Borrowing $ 242,493 $ 142,385
Interest Rate Swap [Member]    
Shares Issued And Outstanding [Line Items]    
Swap agreement, notional amount $ 11,000  
Term Loan, fixed percentage rate 3.01%  
Scruggs Company [Member]    
Shares Issued And Outstanding [Line Items]    
Additional Borrowing $ 22,000